Selector switch mounting for telecommunication systems



March 2, 1948. I Q J BRACKE v 2,436,786

SELECTOR SWITCH MOUNTING FOR TELECOMMUNICATION SYS' IEMS Filed March 1 1946 2 Shets-Sheet ,1

INVENTOR '0. J. J. BRACKE March 2, 1948.

SELECTOR SWITCH MOUNTING FOR 'IIQELECOMMUNICATION SYSTEMS Filed March 1, 1945 2 Sheets-Sheet 2 INVENTOR 0.50m JJfl/PHCKE' Patented Mar. 2, 1948 i r [TED STATES QQFFTEI SELECTOR SWITCH MOUNTINGS FQR: TELE ICOMM'UNICATIONSYSIEMS Oscar J L J; Bra'cke; Antwerpi nelgiumgmssignor to "Intem'ational standard Electric Gorporation, sNew York', N; Y.;.a corporationfot nelaware Application-.Maich 1, 1943,;Serial No. 417,645 In GreatBritahillun320fl939 1 '7 Claims. (61359 2755) 2 a ms-"invention re1atest0 a combined selector the" bay withail -outside cabling 'can be-easily switch'and relaybay for automatic-telephonesyslocated in 'a room having ai -m Ceiling tems and to-the mountings of'groups of switches height."Thcvrtical s ffi 2 S HPP bY- vsllcli' y. *"bearings' (not showm which -in turn 'are attaiched "man automatic telephone system questions of- "to-"brackets -23 wldedto the-=central upright I 4. the physical-Jay-oub of equipment; such as the Up'*the shaft 22*on a 'leiiek'with eacli switch-is a amount of floor space occupied, the ceiling h'eight drive gear 24 which meshes with a flexible-gear necessarypand accessibility-for replacement, are "25 individual to the switch whenithe switchr is to *of considerable:importance;anditis an object "be-driven. Thed-rivinggearsflkare diec'astiand of-ithe present; invention to provide switches and "-'split*--so that t ey y *blifixfiiimflny; Position xnountingsi:for... groups-of'switches whichwshall -atany time; thusniailrimg; itiTl-RIIBQGSSKIYiGDI'O- -idfier improvementsinLthese-an'dIsimiIaI respects. -videa full-equipmentof drives for apartial equip- The nature of the-invention will be understood ---ment-=of switches. Iteis evideht thatcithe: two irom a description of one of its 7 embodiments, halvesof the gear must come tightly togetherzso -s..-reference b eingmade for this purpose to-theeac' thafithe gears may mesh properly but'zt'hisi may c p y g diagram at d Wh c i not-be possibleif thetwoparts eome into a tight T Fig. Iris afrontwview of arcombined switchand i ith th haitAccordingly pads ofirubber I e vb y= in accordance w t th sinve t o (not' shown) or dth'er suitable materials which --="Fig. 2 is a-horizontal section, on a larger scale, Mn nh h avfly,lgompressedymay gbe providedl.benone the line. 2+2 of. Fig. 1; *tweent'he shaft 2zrand the inner surfaces ofzthe -"Figa 3- isa front view on acstill further enlarged o ntral hol in- -the geai tfl. sag-i v bl g d sc'a1e:' and: with parts broken. away, showing. the ze i mmewm fr0ntfbf?l;he"dF VS- "mounting of-athe multiple-lemma b The =switclies*=aremade ==iri two separate parts, i M a s :v f mshown -'namely-the contact bahkiand th brush carriage 1:3;cand e assembly. In; a-group of switches fulfilling. the horizontal Section onitheYline -same="fun'ction =the corresporrdingwontactsi'in all 5 the individual switclnbanks .areamultiplediito- The combined: switch: and relay :bay shown 1 in g'ether mid i tmc 1 t r1211; g: been thedrawing has a frameworkof sheetsiron folded ropos'edfo form t. worms-pending c011- mam-welded, p :base L ta'cts ier a-number bi similan:switches/aseanfin- ..;a-nd larofzrtriangular section and a central upw r p g trip]; a nufnb pofl jbh stripskbeing ri htflfi hann himn. assembled"together in a molding iorm to storm sin Fig; I the switch bayis onvthe left'land the ufiita'ry:e1ement whfghz'cggistitutes'fthepbank';of :erelay; bay aon thezright with :the I vertical driving allithe: wifches They-presentzjnvention makes cshaft arranged between the two. c. The leftrhand; -v c t i p l ewm berzqpp'arenfl vf -upri'ghttgltand thelcentraluprlght- M are spanned u what: @Thusathe .m'umswitchyumtary by hqrizontal switch'supportmg bars Welded contact-"bankis madeasemi-permanent -flxture a to theuprights. at their .ends; 4 while the central i ith v ;,wm s separate" brusrpcarriage v lp eht t 4: auditri ht- .hand upright 13- are emb1y*for each 'switch' is simply plu'gged into mlmnedcbyi a-zrelay-mounting-plate l6, which may; 4o position be in two .01: more sections; At the rear there. are t L iprovided .three; enclosed, compartments,v is e. a i g g w t fig -switchnterminalcompartment I'Lacable (outside 51' 8 3 mg P i, g s icablesycompartment I8 and a relay-wiring comq p ti n w i' t f partment J9. ..At.the bottom ofthe combined bay- 5 OQV esjon kjf mf'ldmgfittmgfwer is locatdthe switch motor "20, individual'toeach hmmntal ham Qf-iheframew0rk1 The bay. .:Attached,to the motor is the necessary re- *moldmg *n-iisiplacedrm P u part Ofjthe fductiongear 2|. "Under the relay' bay-a t switchbay;=.to= the rightvandioitheleftiareplaced .motor fuses and motor starting equipment "Th .:endblocks::282':and-2.9,-likewiseiengagingihe bars motorflfldrives' the vertical shaft 22 -which can: i15ZLSQT as-ztor extend. the-widthe-ofcthelbanks to "bes'electively clutched'to anyindividual switch .iithat.iof- .the switchabay. .The-..block-.-28 at theleft --'sh"aft-tocause movementof the switch brushes imayzibe. medummyzablock. The-":b]-Gck 29:; at. the "*(not 'shown) through a precise range determined iright may:contain:afor'instanceitheejacksfor .the by the" duration-of the clutch engagement. plugsimzcontactsezom;theaswitchafon:thetfeeder 'As separate' terminal stripsaxare not -requir-ed; l wires; andrtheaciutohsmagnet. .dIhet-Jattena block will also mount such local contacts as may be necessary.

The multiple bank molding 21, together with the blocks 28 and 29 that flank it, is held in place 7 with respect to the latter because the contact multiple strips are of expanded metal, and therefore, as indicated at 33 in Fig. 4, the contact-projections from one side of the bank are ,at different levels from the terminal projections on the other side. v

Above each fixing frame 30 is'a correspondingly shaped dust gasket 34 and against this gasket is 4 for the shoes will be held in position by two pins with keyhole washers or their equivalent.

The three uprights l2, l3 and H are perforated as at 31 so that the cable forms and wiring may pass easily from one compartment to the other with simple wiring. The right-hand upright l3 supports one fuse 38 per circuit and the inside of the folded and welded triangle is available through perforations for threading the power, tone, motor and other similar wires.

The relays, of which one of the covers is indicated at 39 are placed in the most convenient manner opposite the associated switches or groups of switches; for example, the line and cut-ofi relays will be connected to the nearest adjacent bank terminals by short horizontal forms with 1 such short vertical runs as are unavoidable. No

clamped the plug-in brush-carriageeassembly including the clutch, the cover thereof being indicated at 35 and the fixingscrews at 36. Of these screws there are four for each switch, passing through the gaskets 34 and frames 30 into threaded bores 38a in the blocks 28, 29, and they are of such a design that the brush-carriage assembly can be'released merely by a quarter or half-turn.

The assembly includes a shockless clutch (not shown) and is capable of being plugged in or out without disturbing any part other than the four holding screws. It is particularly important that they flexible gear shall not be touched or disturbed during this operation. The whole construction is such that, when the-.plug-in brush carriage assembly is secured in position, the

meshing of theyertical-and horizontal gears is correct. No adjustment after mounting is necessary. The plug-in contacts are simple and reliable, and provision is made forthe maximum number of contacts,'including for'instance 10;

for the feeder wires and 2 for the clutch magnet. Preferably all. plug-in contacts and jacks are at that end of the-switch next to the drive. The

clutch assembly may includethe entire spark quencher, with the coil and condenser.

As already, mentioned, the multiple terminal bank consists of expanded strips of drawn metal molded into a solid block, thus eliminating ribbon cabling. A-maximum of ten multiples of the same-switchterminalsof 8 or 0 terminals each: appear verticallyarranged onthe front face. At

the rear the soldering terminals for-each multiple are brought out once every three switches, the first, second, third vertical rows etc., appearing behind the first, second and third switches, etc. The entire multiple bank is molded in three sections of 17 vertical multiples each, thus one complete molded bank has a maximum capacity for 10 switches .of 100 x 4 or 100 x 5 points and at the rear each multiple is brought out three times.

- One set of soldering terminals is spread out over two independently sprung shoes so that the movemerit of one 'does not afiect theother. The brushes are pretensioned and suitably formed so that the workof replacing a set of shoes will be merely'that'of picking out the old shoes and replacing themby new. shoes. The. molded support larger common cable forms are necessary.

Thus it will be seen that the entire front of the molded bank is available for switches and that the entire rear is available for wiring, cabling, cross-connecting and other purposes for which separate robust terminals are usually necessary. The plan eliminates completely a separate ribbon cable, and separate terminal strips and provides for a moisture-proof type of construction.

I claim:

1. A selector switch bay and mounting comprisin three spaced apart hollow uprights disposed between a vertical front plane and avertical rear plane both being tangential to all said uprights and extending parallel to each other,

transverse vertically spaced cross bars extending substantially in said front plane and connecting one of the two outer uprights with the central upright, a relay mounting plate disposed substantially in said front plane and connecting the other outer upright with the central upright, a plurality of vertically spaced brackets projecting forwardly from said central upright at right angles to said front plane, a vertical drive shaft carried by said bracket, vertically spaced gear wheels on said drive shaft, a multiple bank switch molding containing a plurality of superposed contact banks, said molding having contact projections on its front face and being provided on its back face with horizontal rows of terminal projections alternating with transverse grooves fitting over said cross bars, means to secure said molding without interference with the accessibility of said contact projections firmly to said first outer and central uprights, and means "re- 'movably secured to said molding and adapted to carry for each contact bank a sliding brush anddrive mechanism therefor, the latter including a flexible gear capable of meshing with one of the gears on said drive shaft.

-2. A switch bay and mounting, as claimed in claim 1, in which said two outer uprights have triangular cross-sections and said central upright is a rearwardly open channel iron.

3. A switch bay ancl mounting as claimed in claim 1, in which said means to secure said molding to said uprights includes sheet metal frames seated in grooves provided in the front face of said molding.

4. A switch bay and mounting, as claimed in claim 1, in which said contact projections are arranged in horizontal rows, and said means to secure said molding to said uprights includes 7 sheet metal frames seated in grooves provided in the front face of said molding, said frames comprising transverse bars extending across the front of said molding and being vertically staggered 6. A switch bay and mounting, as claimed in claim 1, in which said means to secure said molding to said upright includes, for each contact bank, a sheet metal frame seated in grooves provided in the front face of said molding, said brush carrying means comprises for each contact bank a separate cover supported with its edge upon the corresponding sheet metal frame and fremovably secured to the latter and to the moldi'ng underneath the frame, and a gasket of a shape corresponding substantially to that of the frame interposed between each frame and cover.

7. A switch bay and mounting, as claimed in claim 1, in which all wiring and cable connections are arranged rearwardly of said front plane in the spaces between and inside of said uprights.

OSCAR J. J. BRACKE. 

